code: def case_variations(string):
      return {string.lower(), string.title()}
  
file_path: snips-nlu/snips_nlu/string_variations.py
imports: from __future__ import unicode_literals
  import itertools
  import re
  from builtins import range, str, zip
  from future.utils import iteritems
  from snips_nlu.constants import END, LANGUAGE_DE, LANGUAGE_EN, LANGUAGE_ES, LANGUAGE_FR, RESOLVED_VALUE, RES_MATCH_RANGE, SNIPS_NUMBER, START, VALUE
  from snips_nlu.languages import get_default_sep, get_punctuation_regex, supports_num2words
  from snips_nlu.preprocessing import tokenize_light
label_desc: Use image node_id 7 for calling a global function with example usage: case_variations(string) and returns: unknown